字幕表 動画を再生する 英語字幕をプリント [music playing] HOST: Life in the Sonoran is full of surprises. It rains in the summer, sometimes violently, making it just wet enough to sustain a semi-arid version of the Midwestern grasslands. And with grasslands come the US's most iconic grass cutter, the prairie dog. [music playing] Prairie dogs are, of course, not dogs at all, but are in fact closely related to ground squirrels. Old-timers named them for their dog-like bark. [yip] That's no simple yip. Scientists currently believe that prairie dogs-- [yipping] --have the most sophisticated vocal animal language ever decoded. [music playing] They needed to warn each other. [yipping] Because in the Sonoran, of a lot of things like to eat them, including the badger. [music playing] They dig a complex system of burrows. But most mornings, they have to leave to harvest grass. It's a risky time. So while one feeds, another will keep a look out. It takes a very social animal to be this co-operative. They groom each other a bit like monkeys do. And young prairie dogs love to play fight. [music playing] The center of prairie dog life is the family, ruled by a dominant male with a few females. Families can live in large neighborhoods of thousands. Even as organized as they are, it's still tough to be a prairie dog. Only half live past their first year.